C Tokens

Tokens are individual words and punctuation marks in passage of text. In C, program the smallest individual units are known as C Tokens. C has Six types of Tokens. The Tokens are shown in figure.

Key words & Character set

Instructions in C language are formed using syntax and keywords. It is necessary to strictly follow C language Syntax rules.
Any instructions that mismatches with C language Syntax generates an error while compiling the program.
Keywords should not be used either as Variable or Constant names.
The character set in C Language can be grouped into the following categories.

1. Letters
2. Digits
3. Special Characters
4. White Spaces

White Spaces are ignored by the compiler until they are a part of string constant.